/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * Portions copyright (c) 1999, 2000
 * Intel Corporation.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * 
 *    This product includes software developed by the University of
 *    California, Berkeley, Intel Corporation, and its contributors.
 * 
 * 4. Neither the name of University, Intel Corporation, or their respective
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,
 * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)fdopen.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include "local.h"

#include <libc_debug.h>

FILE *
fdopen(fd, mode)
	int fd;
	const char *mode;
{
	register FILE *fp;
	static int nofile;
	int flags, oflags, fdflags, tmp;

	if (nofile == 0)
		nofile = getdtablesize();

	if ((flags = __sflags(mode, &oflags)) == 0) {
DPRINT(( L"fdopen: bad __sflags\n" ));
		return (NULL);
        }

	/* Make sure the mode the user wants is a subset of the actual mode. */
	if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) {
DPRINT(( L"fdopen: bad fcntl\n" ));
		return (NULL);
        }
	tmp = fdflags & O_ACCMODE;
	if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
DPRINT(( L"fdopen: bad flags %x\n", fdflags ));
		errno = EINVAL;
		return (NULL);
	}

	if ((fp = __sfp()) == NULL) {
DPRINT(( L"fdopen: bad __sfp\n" ));
		return (NULL);
        }
	fp->_flags = flags;
	/*
	 * If opened for appending, but underlying descriptor does not have
	 * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
	 * end before each write.
	 */
	if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
		fp->_flags |= __SAPP;
	fp->_file = fd;
	fp->_cookie = fp;
	fp->_read = __sread;
	fp->_write = __swrite;
	fp->_seek = __sseek;
	fp->_close = __sclose;
	return (fp);
}
